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 #    from this software without specific prior written permission.
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#pragma once
#include "Core/API/Texture.h"

namespace Falcor
{
    /** Image processing utilities.
    */
    class FALCOR_API ImageProcessing
    {
    public:
        using SharedPtr = std::shared_ptr<ImageProcessing>;
        ~ImageProcessing();

        /** Create image processing utility.
            \return New object.
        */
        static SharedPtr create();

        /** Copy single mip level and color channel from source to destination.
            The views must have matching dimension and format type (float vs integer).
            The source value is written to all color channels of the destination.
            The function throws if the requirements are not fulfilled.
            \param[in] pRenderContxt The render context.
            \param[in] pSrc Resource view for source texture.
            \param[in] pDst Unordered access view for destination texture.
            \param[in] srcMask Mask specifying which source color channel to copy. Must be a single channel.
        */
        void copyColorChannel(RenderContext* pRenderContxt, const ShaderResourceView::SharedPtr& pSrc, const UnorderedAccessView::SharedPtr& pDst, const TextureChannelFlags srcMask);

    private:
        ImageProcessing();

        struct SharedData
        {
            size_t refCount = 0;
            ComputePass::SharedPtr pCopyFloatPass;
            ComputePass::SharedPtr pCopyIntPass;
        };
        static SharedData sSharedData;
    };
}
